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Driver and helper classes for using relational databases as identifier mapping services.
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For example, to use a downloadable derby database (pgdb file) as a mapping resource, 
you can use the following piece of code:  
<pre>
	class.forName("org.bridgedb.file.IDMapperRdb");
	mapper = BridgeDb.connect ("idmapper-pgdb:path/to/file.pgdb");
</pre>
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